Telephone.



PATENTED DEC. 19, 1905. J. H. BOYD.

TELEPHONE.

IIIIIIIIIIIII LED DEC. 28 1904.

ELM

l l I I UNITED STATES PATENT OFFICE.

JOHN H. BOYD, OF VAIDEN, MISSISSIPPI.

TELEPHONE.

Specification of Letters Patent.

Patented Dec. 19, 1905.

A li ti fil d December 28, 1904. Serial No. 238,589.

have invented certain new and useful Improvements in Telephones; and I do hereby declare the following to be a full, clear, and exact description of the invention, such as will enable others skilled in the art to which it appertains to make and use the same.

This invention relates to telephones, and more particularly to that class wherein one diaphragm is caused to vibrate from another diaphragm mechanically through the medium of vibrations transmitted along a wire or other suitable medium.

The object of the invention is to provide a simple and efficient means for sending vibrations through the wire to actuate a distant vibrator to call the distant subscriber, a further object of the invention being to provide a simple means for vibrating the wire or transmitting vibrations through it to the distant diaphragm to give signals corresponding to letters, words, or sentences to be transmitted.

Other objects and advantages of the invention will be understood from the following description.

In the drawings forming a portion of this specification, and in which like numerals of reference indicate similar parts in'both views, Figure 1 is a view showing in section the boxes or casings of two telephone instruments, the transmitters being also in section, while the wire, the calling apparatus, and the signaling apparatus are in top plan. Fig. 2 is a vertical section through one of the boxes or casings with the calling and signaling appliances in elevation.

Referring now to the drawings, there are shown two telephone instruments, (indicated generally at A and 13,) these telephone instruments being the same in every part, so that a description of one sufiices for both. Each telephone instrument comprises a casing or box 5, at one end of which and exterior thereto is disposed a transmitter comprising a mouthpiece or funnel 6, at the inner end of which is a diaphragm 7, having attached to its central portion a wire 8, which passes through the box 5 and out at the opposite end thereof, the diaphragm being in spaced'relation to the adjacent end of the box to permit of free vibration of the diaphragm. The wire runs to the box of the opposite instrument and passes through it to the opposite diaphragm, as illustrated in Fig 1.

In conversing over the telephone the soundwaves of the voice are directed through the mouthpiece 6 of the diaphragm 7, and the vibrations are carried by the wire and the opposite diaphragm, which is caused to vibrate in like manner with the well-known result. When one party Wishes to call the other party, it is ordinarily done by tapping with some instrument upon the diaphragm. To obviate this necessity, a call is provided'consisting of a shaft 10, which is rotatably mounted in the sides of the box 5 and has a crank 11 at its outer end for revolving it. Upon the shaft within the box is fixed a disk 11, and from the face of the disk project fingers 12, which are inclined in the same direction rotatably of the disk, so that when the disk is operated in the opposite direction these fingers will successively strike a track across the wire 8 and correspondingly vibrate it to actuate both diaphragms. When the disk is rapidly rotated, the result is a buzzing sound in both transmitters.

When it is difiicult to understand conversation over the wire, messages may be sent by signaling, which may be done by striking the wire within the telephone-box one or more times corresponding to letters or to words or to complete messages. Charts may be provided explaining the difierent signals, and these charts may be numbered so that the first signal sent over the wire may indicate the chart to be used. To strike the wire to give signals, a spring-arm 13 is mounted upon the inner face of one side of the box and extends transversely beneath and beyond the wire 8, where it lies between the vertically-spaoed guide-fingers 14. A shaft 15 is journaled in the sides of the box and has a crank 16 exterior to the box for rotating it. On the shaft 15 is fixed a drum 17, provided with arms 18, which when the drum is rotated successively engage the spring-arm 13 and depress and release it, so that in its return it will strike the wire 8 and vibrate it. This shaft is rotated with a step-by-step movement in a manner to correspond to the number of strokes delivered by the arm 13 against the wire, which strokes in turn correspond to the signal to be sent. The guide-arms insure proper direction of movement of the spring striking-arm.

l/Vhat is claimed is 1. In a telephone, the combination with a box, of a transmitter mounted exterior to the box and including a diaphragm, a wire passed through the box and attached to the diaphragm, a shaft rotatably mounted in said box, a disk carried by the shaft, fingers carried by the disk and projecting at an acute angle therefrom and rearwardly from the direction of rotation of said disk, and arranged to engage said wire to vibrate the same when the said shaft is rotated.

2. A telephone, comprising a box, a transmitter carried by the box and including a diaphragm, a wire passed through the box and attached to the diaphragm, a spring-arm disposed transversely of the wire and normally 

